Pinblock for Baldwin SF-10

[Dean May]

When you are using a very hard pin block there is no margin for error in
your interference fit with the tuning pin. You must design a reduced
interference or the torque levels will be too high. With less nominal
interference you’ll end up with a loose pin if the pin tolerance goes small
and the drilled hole tolerance goes large. 

 

When using a softer block you can design a greater interference fit and
still end up with a great feeling pin with a reasonable level of torque. 

 

Dean

Dean May             cell 812.239.3359 

PianoRebuilders.com   812.235.5272 

Terre Haute IN  47802

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Greg Newell
Sent: Monday, January 14, 2008 1:51 PM
To: 'Pianotech List'
Subject: RE: Pinblock for Baldwin SF-10

 

Al,

                I don’t see the problem with using Delignit blocks if you
are careful with your drilling. It seems that drilling is the key no matter
what block you use. I personally like to drill a sample piece after cutting
and shaping the block to fit the flange and then waiting to see what time
does to it while waiting for other parts and strings to arrive. Doesn’t
matter which block just see what the sample did and adjust accordingly. 

                What went wrong? Could have been too tight from the factory
(never seen this before on a Baldwin :-)) and someone tried to heat or
otherwise treat the pins and their solution went awry? It could have been a
spill of some kind. Heck, could be just about anything, no? What happened is
kind of a moot point. It now is, what it now is. Your job, should you choose
to accept it, is to effect a solution.

 

Greg Newell

Greg's Piano Forté

www.gregspianoforte.com

216-226-3791 (office)

216-470-8634 (mobile)

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of AlliedPianoCraft
Sent: Monday, January 14, 2008 1:18 PM
To: Pianotech List
Subject: Pinblock for Baldwin SF-10

 

I am installing a new pinblock in a Baldwin SF-10. This piano is only 10
years old, but the pinblock has been destroyed by the use of metal tuning
pin sleeves in combination with CA glue (about 30 to 40 sleeves and glue all
over the place). I can't imagine a 10 YO piano with what appears to be a
Delignit pinblock get so loose that it required this kind of desperate
repairs.

 

My question to the other rebuilders is this. I have always used Bolduc
pinblocks in Steinways and Masons and have used Multi-Laminate pinblocks in
lesser pianos, (never had loose tuning pins in 40 years), but I have never
used a Delignit pinblock. Should I replace this pinblock with the Delignit
(which now scares me) or one of the others? Also any thoughts on what might
have gone wrong with this piano?

 

Thanks for any input

 

Al Guecia
Allied PianoCraft
PO Box 1549
High Point, NC 27261
(336) 454-2000
PianoTech at alliedpianocraftcom <mailto:PianoTech at alliedpianocraft.com> 
www.alliedpianocraft.com

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